Valve.



. J. v. SCHMID. VALVE.

APPLICATION FILED MAY l1, 1910.

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WI'NE8-SES .I y y A 'BY y(- I 'Arronwev UNITED sTirriisv PATENT onirica.

JOHN V. SCHMID,l OF WYNDMOOR, PENNSYLVANIA, ASSIGNOR TO NELSON VALVE COMPANY, A CORPORATION OF PENNSYLVANIA.

s VALVE.

Speccation'of Letters Patent.

Patented July 23, 1912.

il Application led May 11, i910. Serial No. 560,677.

fication, reference being had to tlieaceom.

panying drawings. Y

This invention particularly relates to nonreturn or clieckwalvesof the class designed to prevent chattering or hammering of the valve4 disk upon 'its scat., diie to the rapid intermittent. pressure upony said disk. Valves of this class are usually provided with a dash-pot, comprising a cylinder and piston having its movable member connected to be shiftedin accordance with the movement of the valve disk, and the bearing surfaces of said cylinder and piston have relatively differentl areas. "ln practice, the stroke or rise of the valve disk Varies and normally is but a small fraction of the full stroke of said disk, and consequently, that portion of the bearing surface-of the dashpot members, which is less frequently traversed, is subject to the usual deposits due to the metallic contactl with the steam, Water. or other fluid, and said deposits thus collected prevent the free movement of the dash-pot members, and consequently liaiiiper the free operation ot' the valvedisk. I `urtlierinore, as the relative moveinent. ot' tlie dash-pot members is principally,within a limited range, the region ot' tlie'longer member which is mostly traversed by the shorter iiien'ibcr, becomes worn, and shoulders are tlius formed which prevent. the tree relative movement of said dash-pot menibers, eventually causing thevalve disk tol chatter and hammer on its seat. 1

It is the principal object of this inven- .tion to obviate t-lie ditliculties iabovfe set forth, and to provide such a valve, with a valve disk connected with the dash-pot, so constructed as to permit the valve'disk to respond to very small ditl'erences in pressure upon its opposite sides and to prevent any deposits of solid'material collecting upon the bearing surfaces of the cylinder and piston, and to prevent the wearing ot' said surfaces in zones.

Further objects of .this invention are to provide an auxiliary valve stein normally.

disconnected 4from the valve disk, arranged depending from said valve disk 8.

to control its movement, to provide reiiiovable means to prevent the rotation ot said auxiliary valve stem, and to provide a dashpot of such construction as to be readily adapted to an ordinary valve.

The form of this inventionliei-einafter described, provides a valve casing comprising` a removable bonnetliaving the usual stuffing box, with a valve seat; a Valve disk cooperative with said seat to control said valve, and provided with a stein; a dash-pot comprising a cylinder removably fitted in said lasing, and having a piston secured to i said valvestcin; an auxiliary valve stem extending through the packing 1n said stiitliiig box,and arranged to reciprocate toengage and. 'discngage said valve stein within said casing, and provided With a threaded region exterior to said casing, and having a recess providing a flat surface; a detachable bearing on said bonnet.; a hand wheel liaving'a hub mounted to rotate in said bearing, in threaded engagement with said auxiliary 'valve stem; and a block loosely retained in a socket in said bonnet, in engagement with the flat| recess on said auxiliary valve stein, and arranged to prevent the relative rotation of said auxiliary valve stein With i'ef/ spect to said casing, whereby the rotation of said hand wheel. effects the reciprrxiation ot' said auxiliary stein relative to said valve stein.

This invention also includesthe various novel features of construction and arrangement hereinafter more definitely specified.

ln the accompanying drawings, Figure 1 is a .vertical longitudinal sectional view ot, a valve comprising a convenient. embodi- -ment otl this invention; Fig. 2 is a plan lseetional view ot said valve taken on theI line' 2--2 of Fig. l; Fig. i) is a plan view of the' 'thereranged to be controlled by the valve disk 8 arranged to engage'the seat S), which is in threaded engagement. with the valve asing 5, and includes the spider 10, having the guide bearing l1 for the stem extension 1Q, Said valve disk 8 isprovided with the upwardly extending stem 14 Whichis provided with the piston 15 secured thereon by the nut 16 in threaded engagement with 'said stem lll.

The piston has its opposite curved or eircular edges 17 sharpened and is mounted for reciproeation in the cylinder 18 whose bearing surface 19,is substantially coextensive with the bearing surface 20 of said lpis.on, so that as said pister returns to its normal position'its bearing surface wipes over and covers the entire bearing surface of thecylinder andany deposit thereon is scrapedrof by the sharpened edge of said piston. Thus it willbe seen that it is impossible for the bearing surfaces of either the cylinder or piston to corrode or be otherwise effected by deposits; but, on the contrary,

said surfaces are maintained free rby the const-ant wipingr action of the relative movement of said piston. Said cylinder 18, is closed at its lower endto form the closed chamber 21and is provided with the outwardly extending flange 22 which is seated in the recess 23 in the upper face of the casing and retained therein by the bonnet. 24, secured to said casing by the bolts 25. Said bonnet 24 is provided with the stutling box 26 inclosing the packing 27, which -is adjusted by the gland'QS and said bonnet carries the yoke frame 30 having the flanged pad 3l provided with the aperture 32, and the recess 33 at one side of said aperture. The yoke frame 30 carries the bearing 34 which is secured to said padBl by the Abolts 35, and .said bearing retains the hub 36 of the hand Wheel 37in rotatable relation with said frame 30, said wheel 'and hub being rigidly secured together bythe nut 38.

The valve maybe manually controlled by the reciprocatory auxiliary valve stem 40, which has a threaded portion 4l in threaded engagement with the hub 3G and said auxih iary stem is provided with the longitudinal recess 42 having a vflat surface lagainst which the removable block or key '4ibears.. Said block 43 is arranged to prevent the rotation of said stem 40, land is loosely mounted in the recess 33 in the' yoke frame 50.

4 The auxiliary valve stem 4() extends through'the stulling box, and is provided with the head 47, which is arranged to engage the seat 48,. to preventleakage around.l

said stern when said valve is operative, and

said head may be shifted downwardly by rotation of the hand wheel 37, to engage the upper end of the valve stem 14, and thereby retain the valve 'disk 8 upon its seat 9 to prevent the passage of .fluid through the 4inlet and outlet connections of the valve.

The extent of movement of the valve disk 8 may also be regulated by the'auxiliary.

valve stem 40, which may be shifted to linit its maximum stroke.

It may be observed that owing toJ the different coellicient of expansion of the valve casing and -t-he dash-pot cylinder, it is desir-able to provide for their relative expan'- sion and contraction, and therefore, the

dash-pot cylinder 18, as shown 'in Fig-1, of the drawing, is formed slightly smallerl than the casing wallswhich inelose it.

The valve herein described is particularly adapted for use in connection with a battery of boilers wherein each boiler is provided with such 'a valve and connected with the inlet thereof, the' outlet of said valve being connected to a header common to the outlets of the valves of each'boiler, and so arranged that when one of the boilers in the battery becomes disabled or the pressurev therein falls below the pressure of the other boilers, the valve of the disabled or tardy boilerwill automatically close and prevent the 'pressure from the other boilers of the battery from entering said disabled boiler.

Said header is usually connected with an engineer other pressure consuming device, and therefore .it will be seen that the pressure will be constantly varying therein,

'which will tend to intermittently open.. and close the valve disk "8, and as said valve disk is alternately raised and lowered, the air or other fluid within the dashpot Will be shifted to the opposite sides of the pistonl 15, escaping between the bearing surfaces 19 and 2O of said piston l5 and cylinder' 18 re'- speetively. l

In order to prevent trapping of condensate in the dash'pot, the central web of the piston l5 is provided with a pin holev 50 and the bottoni wall of the cylindervl is provided lwith the pin hole 5l whereby if. any condensation `is effected within the dash pot the condensate thus produced is per-v mitted to escape therefrom into the valve using 5.

It 1s not desired to limit this invention to the precise details of construction and arrangement herein set forth, as it is obvious that various modifications may be Amade therein without departing from the essential features of the invention as defined in the appended claims.' 4

Having thus described my invention, l Claim:

-1. A valve having cushioning lmeans to' prevent its rapid opening and closing, coin-V prising relatively movablemembers each having bearing surfacesl which are included between oppositely 'directed free edges, and which are si'ibstantially 'coexte'nsive, and longer than their relative movement.

2. A valve controlled by a dash-pot comprising rela-tively movable members each having bearing surfaces included between oppositelyvdireeted free. edges, which are spaced apartin excess of the length of the valve stroke, and normally register.

In a valve, vthe combination with 'a 5. I n a valve, the combination with con-v ,'trolling means, of cushioning means for -preventing the rapid actuation of said controlling means, and comprising relatively .mov able members Whose bearing surfaces each terminate in oppositely directed free edges,

and are maintained in contact, irresp'et'ztive of the movement of said controlling means', and are normally substantially coeXtensive.

6. In a valve, the combination with means to control the passage of fluid therethrough, of a dash-pot comprising a cylinder having a bearing surface disposed between 'free edges, of a piston connected vwith said controlling means, and having a bearing'surface l whose opposite edges'respectively register with the opposite edges of the bearing sur-` face of said cylinder, when said controlling means is in a position to close said valve, and means preventing the disengagement of the said surfaces, irrespective of the ontrolling` means.

7. In a valve, the combination i ith a valve disk arranged to control said valve, of a dash-pot comprising a cylinder mounted in said valve, forming an inclosed chamber and having a bearing surface terminating in oppositely directed free edges, a piston connected with said valve disk and having a bearing surface in constant engagement with the bearing surface in said cylinder, the opposite edges of which normally register with the opposite free edges of the bearingl surface of said cylinder, when said valve disk is in a position to close said valve.

8. In a valve, the combination with a valve disk arranged to aiiton'iatically controlk said valve and comprising a stein terminating within said valve,a relatively movable auxiliary valve stem arranged to engage the stem on said valve disk to control the movement ofA said disk, means to reciprocate said auxiliary stem, a dash-pot comprising a cylinder having a bearing surface of greater length than the maximum 'movement of said valve disk and terminating in oppositely disposed free edges, a piston on said valve stein having a bearing surface whose opposite edges normally register with the opposite edges of the bearing surface in said cylinder.

i). In a valve comprising a seat, the coinbiiiation with a valve disk cooperative with said seat-to control the passage of 'fluid therethrough, and having a stein terminaling Within said casing, an .auxiliary valve stem coperativewith the stem on said' valve disk to control said valve disk,`and extending exterior to said casing, and having Va threaded portion, and-a recess providing a plane surface joining the cylindrical wall f said stein, a block exterior to the valve chamber removably tit-ted within said recess and engaging said plane surface to prevent rotation of said auxiliary stem, and a hand wheel comprising a hub in threaded engagement with said auxiliary stem arranged for relative rotation therewith to reciprocate 'said auxiliary stem with respect -to said valve stem. A

p 10. In' a valve, the combination with a valve disk arranged to automatically control the passa 'e of iuidthrough 'said valve, of a dash-pot comprising. a cylinder and piston, said p'isto-n being connected With said valve disk, and having curved sharpened edges which are uninterrupted, and spaced sub stantially coincident With the edges of thel bearing surface of said cylinder when said valve disk is in position to close lsaid valve.

11,. A valve comprising a seat, a valve disk coperative With saidseat to control the passage through said valve, land having a stem, a dash-pot within the valve closure, having an open and a closed end, and com.- prising a cylindrical bearing surface and a recessed portion adjacent to its closed end, said bearing surface being included between the open edge and the edge formed by said recess, vand a piston connected with said stem, and fitted to slide in said dash-pot and to engage the entire cylindrical surface upon each movement to its normal position. i

12. A valve, comprising a seat, a valve disk coperative with said seat to control said valve, and having a stem terminating Within the valve closure, a yoke carried by said valve, and comprising a'bearing and having a recess in its top face,'an auxiliary stemcoperative with the stem of said valve disk to control the movement of said disk, Vand having a recessed threaded portion extendingV through said bearing, a 'hand wheel mounted in said bearing, operative to engage with the threads on said auxiliary` stem to reciprocate said stein, and a block mounted in said bearing andengaging with the recesses in said auxiliary' stein to prevent rotation of the latter.

13. A valve, comprising. a seat, a valve disk cooperative with said seat to conti-ol,

.with the bearing surface of the dash-pot, a

yoke carried by said valve having a stuffing box, and a bearing, an auxiliary .st-ein ex-A tended through said stiitling box, and having a recessed threaded portion forming a flattened surface, a hand Wheel mounted to rotatein said bearing, and operative to engage the threads of said auxiliary stem to reciprocate thel latter through said vstuiing box, to control the movement of said valve disk, and means carried by said bea-ring, cooperative with and extending transversely of, and beyond the flattened surface of saidv auxiliary stem to prevent rotation of said auxiliary stem.

14.' A valve comprising a seat, a disk c0- operative with said seat to control the passage through said valve, and having a stem, a dash-pot Within tli'e valve closure, having an open and a closed end and comprising a Cylindrical bearing surface terminating in an annular recess adjacent to said closed end, and a vpiston connected with said valve stem and fitted to slide in said dash-pot9 and having its inner edge coincident with the edge formed by said recess when the valve disk is in closed position upon its seat.

l In Witness whereof I haive hereunto set my hand, this 'tenth day of May, A. 1910.

JoHN v. seHMiD.

J/Vitnesses:

ALEXANDER PARK, CLIFTON G. HALLOWELL. 

